From c0385a6b9ca8f8dc7855f0d63511004ec26fcc3f Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Thu, 9 May 2024 15:45:05 -0400
Subject: Modules/Compiler/Clang: add a reason for non-`libc++` compilations

See: #25965
---
 Modules/Compiler/Clang-CXX-CXXImportStd.cmake | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Modules/Compiler/Clang-CXX-CXXImportStd.cmake b/Modules/Compiler/Clang-CXX-CXXImportStd.cmake
index 55dbfb8..f58f17e 100644
--- a/Modules/Compiler/Clang-CXX-CXXImportStd.cmake
+++ b/Modules/Compiler/Clang-CXX-CXXImportStd.cmake
@@ -1,5 +1,8 @@
 function (_cmake_cxx_import_std std variable)
   if (NOT CMAKE_CXX_STANDARD_LIBRARY STREQUAL "libc++")
+    set("${variable}"
+      "set(CMAKE_CXX${std}_COMPILER_IMPORT_STD_NOT_FOUND_MESSAGE \"Only `libc++` is supported\")\n"
+      PARENT_SCOPE)
     return ()
   endif ()
 
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